Harvesting plant after lights turn on

Is it bad to harvest a plant after the lights on cycle has started?

If you’re talking a short amount of time probably not. But i wouldn’t do it after they have been running for hours

Will 20 min make the weed taste like crap are there any other negative effects of the plants recieving a bit of light just before harvest

Nah theres a good amount of people that dont do any dark period at all and hang their girls whenever they think its finished ,you’ll be fine